EP3813490B1 - Light source calibration and aging compensation system - Google Patents
Light source calibration and aging compensation system Download PDFInfo
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- EP3813490B1 EP3813490B1 EP20203163.9A EP20203163A EP3813490B1 EP 3813490 B1 EP3813490 B1 EP 3813490B1 EP 20203163 A EP20203163 A EP 20203163A EP 3813490 B1 EP3813490 B1 EP 3813490B1
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- light
- light source
- source driver
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- 238000005286 illumination Methods 0.000 claims description 61
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- 239000003086 colorant Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
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- 230000001419 dependent effect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical feedback
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D47/00—Equipment not otherwise provided for
- B64D47/02—Arrangements or adaptations of signal or lighting devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D2203/00—Aircraft or airfield lights using LEDs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D2221/00—Electric power distribution systems onboard aircraft
Definitions
- LED-emitting diode (LED)-based light fixtures are currently used in a variety of lighting applications.
- LED light strips can be used for aircraft cabin lighting and other interior/exterior lighting applications.
- the replacement of a light fixture after a period of time may result in color and/or illumination level imbalances between the replaced (new) light fixture and a neighboring (old) light fixture because the light sources (e.g., LEDs) of the new light fixture may run more efficiently (hence brighter) than the light sources of the old light fixture. Consequently, there is a need for lighting system improvements that help prevent or mitigate color and/or illumination level imbalances between neighboring light fixtures.
- LED fixtures are disclosed in US 2009/116232 .
- the invention relates to a system for light source calibration and aging compensation according to claim 1.
- Preferred embodiments of the invention are defined by the dependent claims.
- the light source driver comprises a direct current (DC) power source
- the one or more control signals cause the DC power source to adjust a current of the one or more power signals generated by the light source driver.
- DC direct current
- the light source driver comprises a pulse width modulator (PWM), and the one or more control signals cause the PWM to adjust a duty cycle of the one or more power signals generated by the light source driver.
- PWM pulse width modulator
- the light source driver comprises a red-green-blue (RGB) or red-green-blue-white (RBGW) light-emitting diode (LED) driver
- the one or more control signals cause the RGB or RBGW LED driver to adjust a current and/or a duty cycle of the one or more power signals generated by the light source driver.
- a letter following a reference numeral is intended to reference an embodiment of the feature or element that may be similar, but not necessarily identical, to a previously described element or feature bearing the same reference numeral (e.g., 1, 1a, 1b).
- reference numeral e.g. 1, 1a, 1b
- Such shorthand notations are used for purposes of convenience only and should not be construed to limit the disclosure in any way unless expressly stated to the contrary.
- any reference to “one embodiment” or “some embodiments” means that a particular element, feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment disclosed herein.
- the appearances of the phrase “in some embodiments” in various places in the specification are not necessarily all referring to the same embodiment, and embodiments may include one or more of the features expressly described or inherently present herein, or any combination of sub-combination of two or more such features, along with any other features which may not necessarily be expressly described or inherently present in the instant disclosure.
- a system for light source calibration and aging compensation is disclosed.
- lighting systems that include multiple light fixtures (e.g., stacked or daisy chained light-emitting diode (LED) light strips, light tubes, light panels, or the like)
- the replacement of a light fixture after a period of time may result in color and/or illumination level imbalances between the replaced (new) light fixture and a neighboring (old) light fixture because the light sources (e.g., LEDs) of the new light fixture may run more efficiently (hence brighter) than the light sources of the old light fixture.
- the system disclosed herein helps to prevent or mitigate color and/or illumination level imbalances between neighboring light fixtures.
- the system disclosed herein can also provide for more consistent illumination power output by a light source/fixture over its useful lifecycle.
- FIG. 1 is a block diagram illustrating a light fixture 100 that includes a system for light source calibration and aging compensation, in accordance with one or more embodiments of this disclosure.
- the light fixture 100 may be a light strip or any other type of light fixture (e.g., light bulb, light tube, light panel, etc.) that includes a plurality of light sources 102 (e.g., LEDs).
- the light fixture 100 may include a light strip for an aircraft cabin lighting system or any other interior/exterior lighting system.
- the light sources 102 may be connected in series with one another. Alternatively, one or more of the light sources 102 may be connected in parallel or in a combination of series and parallel configurations.
- the light sources 102 include multi-color LED light sources.
- the light sources 102 may include red-green-blue (RGB) or red-green-blue-white (RGBW) LEDs or LED chips.
- light sources 102 include single-color LED light sources.
- the light sources 102 may include individual red, green, blue, and/or white LEDs or LED chips.
- the light sources 102 may include a combination of multi-color and single-color LED light sources.
- the light fixture 100 further includes or is coupled to a light source driver 106.
- the light source driver 106 is configured to generate one or more power signals for the plurality of light sources 102.
- the light source driver 106 may be configured to receive an alternating current (AC) or direct current (DC) input from a power source (e.g., an aircraft power system or any other mobile/stationary power system) and generate one or more constant or pulsed DC output signals to power the light sources 102.
- the light source driver 106 may include a DC power source (e.g., an AC-DC or DC-DC converter and/or adapter) and/or a pulse width modulator (PWM).
- DC power source e.g., an AC-DC or DC-DC converter and/or adapter
- PWM pulse width modulator
- the light source driver 106 is a RGB or RBGW LED driver that is configured to output a separate power signal for each of the LED colors (e.g., separate red (R), green (G), blue (B), and/or white (W) signals).
- the light source driver 106 can separately control the LED brightness for each LED color in order to tune individual light sources 102 (e.g., multi-color light sources) or a group of light sources 102 (e.g., single-color or multi-color light sources) to different colors and/or brightness resulting from different combinations and respective brightness of red (R), green (G), blue (B), and/or white (W) LED emissions.
- the illumination power output by the light sources 102 (hence the brightness of the light sources 102) can be controlled by varying current and/or duty cycle of the one or more power signals generated by the light source driver 106.
- the light source driver 106 may be configured to generate higher current power signals to increase LED brightness overall or for one or more selected LED colors (e.g., by increasing the current of the power signals for the one or more selected LED colors).
- the light source driver 106 may be configured to generate reduced current power signals to decrease LED brightness overall or at one or more selected LED colors (e.g., by reducing the current of the power signals for the one or more selected LED colors).
- the light source driver 106 may be configured to increase or decrease LED brightness overall or at one or more selected LED colors by generating power signals with increased or reduced duty cycle (e.g., by adjusting pulse width and/or frequency of the power signals).
- the light fixture 100 further includes or is coupled to one or more sensors 104 (e.g., one or more photodiodes, photoresistors, or any other photodetectors).
- the light fixture 100 may include a sensor 104 that is configured to detect an illumination power output by at least one light source 102 of the plurality of light sources 102.
- the sensor 104 may be positioned adjacent to one particular light source 102 or a particular group of light sources 102.
- the illumination power detected by the sensor 104 is used for calibration and/or aging compensation of the light fixture 100 as a whole (e.g., the measured illumination power is used to calibrate/tune all the light sources 102).
- the light fixture 100 may include a plurality of distributed sensors 104, where each of the sensors 104 is configured to detect an illumination power that is used to calibrate/tune a respective light source 102 or a respective group of light sources 102.
- the light fixture 100 may include a plurality of distributed sensors 104, where the measurements from the sensors 104 are averaged or otherwise combined in order to calibrate/tune all the light sources 102 based on a number of illumination power measurements associated with different illumination sources 102 or groups of illumination sources 102 (e.g., at different locations/zones of the light fixture 100).
- the light fixture 100 may further include or may be coupled to a controller 200 that is programmed or otherwise configured to perform light source calibration and aging compensation functionality based on the sensor measurements.
- the controller 200 is communicatively coupled to the one or more sensors 104 and the light source driver 106.
- the controller 200 may include at least one processor 202, at least one memory 204, and at least one communication interface 206.
- the processor 202 provides processing functionality for at least the controller 200 and can include any number of processors, micro-controllers, circuitry, field programmable gate array (FPGA) or other processing systems, and resident or external memory for storing data, executable code, and other information accessed or generated by the controller 200.
- the processor 202 can execute one or more software programs embodied in a non-transitory computer readable medium (e.g., memory 204) that implement techniques described herein.
- the processor 202 is not limited by the materials from which it is formed, or the processing mechanisms employed therein and, as such, can be implemented via semiconductor(s) and/or transistors (e.g., using electronic integrated circuit (IC) components), and so forth.
- the memory 204 can be an example of tangible, computer-readable storage medium that provides storage functionality to store various data and/or program code associated with operation of the controller 200/processor 202, such as software programs and/or code segments, or other data to instruct the processor 202, and possibly other components of the controller 200, to perform the functionality described herein.
- the memory 204 can store data, such as a program of instructions for operating the controller 200, including its components (e.g., processor 202, communication interface 206, etc.), and so forth.
- a single memory 204 is described, a wide variety of types and combinations of memory (e.g., tangible, non-transitory memory) can be employed.
- the memory 204 can be integral with the processor 202, can comprise stand-alone memory, or can be a combination of both. Some examples of the memory 204 can include removable and non-removable memory components, such as random-access memory (RAM), read-only memory (ROM), flash memory (e.g., a secure digital (SD) memory card, a mini-SO memory card, and/or a micro-SD memory card), solid-state drive (SSD) memory, magnetic memory, optical memory, universal serial bus (USB) memory devices, hard disk memory, external memory, and so forth.
- RAM random-access memory
- ROM read-only memory
- flash memory e.g., a secure digital (SD) memory card, a mini-SO memory card, and/or a micro-SD memory card
- SSD solid-state drive
- magnetic memory magnetic memory
- optical memory optical memory
- USB universal serial bus
- the communication interface 206 can be operatively configured to communicate with components of the controller 200.
- the communication interface 206 can be configured to retrieve data from the processor 202 or other devices, transmit data for storage in the memory 204, retrieve data from storage in the memory 204, and so forth.
- the communication interface 206 can also be communicatively coupled with the processor 202 to facilitate data transfer between components of the controller 200 and the processor 202. It should be noted that while the communication interface 206 is described as a component of the controller 200, one or more components of the communication interface 206 can be implemented as external components communicatively coupled to the controller 200 via a wired and/or wireless connection.
- the controller 200 may be connected to one or more input/output (I/O) devices, system components (e.g., light sources 102, sensor 104, light source driver 106, etc.), and so forth via the communication interface 206.
- the communication interface 206 may include a transmitter, receiver, transceiver, physical connection interface, or any combination thereof.
- the controller 200 is configured to compare the illumination power detected by the one or more sensors 104 to a target illumination power (e.g., a preprogrammed, user selected, calculated, or otherwise determined illumination power for the light fixture).
- a target illumination power e.g., a preprogrammed, user selected, calculated, or otherwise determined illumination power for the light fixture.
- the controller 200 may be configured to compare the target illumination with an illumination power measured by a single sensor 104, a plurality of illumination power measurements from multiple sensors 104, or an average illumination power measurement based on a plurality of illumination power measurements from multiple sensors 104.
- the target illumination power may be a preprogrammed illumination power (e.g., based on initial brightness setting) or an illumination power determined via a calibration sequence.
- the target illumination power can be a fraction (e.g., in the range of 60% to 90%, e.g., 60%, 65%, 70%, 75%, 80%, 85%, or 90%) of the maximum illumination power output of the light sources 102 (i.e., based on a new/unused light fixture).
- the target illumination power may be a known value that is predetermined for the light fixture 100 based on light source specifications.
- the target illumination power may be a calculated value determined by running the light sources 102 at an initial (e.g., maximum or reduced, e.g., 60%, 65%, 70%, 75%, 80%, 85%, or 90%) operating current or duty cycle at installation (or a later performed calibration) and determining the target illumination power based on illumination power detected by the one or more sensors 104.
- the controller 200 may be configured to detect or calculate the target illumination power by detecting or calculating a fraction (e.g., 60%, 65%, 70%, 75%, 80%, 85%, or 90%) of the maximum illumination power output of the light sources 102.
- the target illumination power may be received by the controller 200 from another device (e.g., a lighting system controller, a master light fixture, a user input device, or the like).
- the controller 200 may be configured to generate one or more control signals to adjust an electrical power output of the light source driver 106 based on the comparison of the detected illumination power to the target illumination power.
- the controller 200 may be configured to generate the one or more control signals based on a difference between the detected illumination power and the target illumination power.
- the one or more control signals from the controller 200 are configured to cause the light source driver 106 to adjust the one or more power signals for the plurality of light sources 102 until the illumination power detected by the one or more sensors 104 is equivalent to the target illumination power or within a predefined acceptable tolerance of the target illumination power (e.g., +/- 5%, +/- 10%, +/- 15%, or the like).
- the one or more control signals may cause the light source driver 106 to generated the one or more power signals with an adjusted (e.g., increased/reduced) current and/or duty cycle in order to increase/decrease the illumination power (brightness) of the light sources 102 overall and/or at particular colors (e.g., red (R), green (G), blue (B), and/or white (W)) emitted by the light sources 102.
- an adjusted (e.g., increased/reduced) current and/or duty cycle in order to increase/decrease the illumination power (brightness) of the light sources 102 overall and/or at particular colors (e.g., red (R), green (G), blue (B), and/or white (W)) emitted by the light sources 102.
- the light fixture 100 is a light strip, light tube, light panel, or other light structure that has the light sources 102, one or more sensors 104, light source driver 106, and controller 200 coupled to or at least partially embedded in the lighting structure.
- the one or more sensors 104, light source driver 106, and/or controller 200 may be at least partially embedded in a substrate that includes a linear, two-dimensional, or three-dimensional array of light sources 102.
- one or more of the components may be coupled to the substrate (e.g., directly or via an auxiliary printed board).
- the light fixture 100 may be configured to be stacked, daisy chained, or otherwise coupled with one or more neighboring light fixtures 100 (e.g., additional light strips).
- FIG. 3 shows an example of the lighting system 300 that includes a plurality of light fixtures 100 (e.g., light fixtures 100A, 100B, and 100C) coupled with one another.
- the controllers 200A, 200B, and 200C of various light fixtures 100A, 100B, and 100C that make up a lighting system 300 may be communicatively coupled with one another.
- the controllers 200A, 200B, and 200C may be physically coupled by one or more data cables and/or wirelessly coupled (e.g., via wireless networking or ad-hoc wireless communication).
- the controller 200A of a light fixture 100A may be configured to communicate illumination power detected by a respective sensor 104A to another controller (e.g., controller 200B or 200C) of another light fixture (e.g., light fixture 100B or 100C) that is coupled to the light fixture 100A.
- another controller e.g., controller 200B or 200C
- another light fixture e.g., light fixture 100B or 100C
- the illumination power detected by sensor 104A of light fixture 100A can be used as the target illumination power for light fixture 100B and/or 100C.
- all the light fixtures 100 in the lighting system 300 are calibrated to a master light fixture (e.g., light fixture 100A). In other embodiments, all the light fixtures 100 in the lighting system 300 may be calibrated to the light fixture (e.g., light fixture 100A, 100B, or 100C) having the weakest illumination power output. In some cases, the oldest or most heavily used light fixture (e.g., light fixture 100A, 100B, or 100C) will have the weakest illumination power. In this regard, the oldest or most used light fixture (e.g., light fixture 100A, 100B, or 100C) may be automatically designated as the master light fixture.
- a master light fixture e.g., light fixture 100A
- all the light fixtures 100 in the lighting system 300 may be calibrated to the light fixture (e.g., light fixture 100A, 100B, or 100C) having the weakest illumination power output. In some cases, the oldest or most heavily used light fixture (e.g., light fixture 100A, 100B, or 100C) will have the weakest
- the lighting system 300 may be configured to run all the light fixtures 100 at the same current or duty cycle and then designate the light fixture (e.g., light fixture 100A, 100B, or 100C) having the weakest illumination power as the master light fixture and/or calibrate the light fixtures 100 to the light fixture (e.g., light fixture 100A, 100B, or 100C) having the weakest illumination power.
- the light fixture e.g., light fixture 100A, 100B, or 100C
- the light fixture 100A, 100B, or 100C having the weakest illumination power.
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Description
- Light-emitting diode (LED)-based light fixtures are currently used in a variety of lighting applications. For example, LED light strips can be used for aircraft cabin lighting and other interior/exterior lighting applications. In lighting systems that include multiple light fixtures (e.g., stacked or daisy chained LED light strips, light tubes, light panels, or the like), the replacement of a light fixture after a period of time may result in color and/or illumination level imbalances between the replaced (new) light fixture and a neighboring (old) light fixture because the light sources (e.g., LEDs) of the new light fixture may run more efficiently (hence brighter) than the light sources of the old light fixture. Consequently, there is a need for lighting system improvements that help prevent or mitigate color and/or illumination level imbalances between neighboring light fixtures. LED fixtures are disclosed in
US 2009/116232 . - The invention relates to a system for light source calibration and aging compensation according to claim 1. Preferred embodiments of the invention are defined by the dependent claims.
- In some embodiments of the system, the light source driver comprises a direct current (DC) power source, and the one or more control signals cause the DC power source to adjust a current of the one or more power signals generated by the light source driver.
- In some embodiments of the system, the light source driver comprises a pulse width modulator (PWM), and the one or more control signals cause the PWM to adjust a duty cycle of the one or more power signals generated by the light source driver.
- In some embodiments of the system, the light source driver comprises a red-green-blue (RGB) or red-green-blue-white (RBGW) light-emitting diode (LED) driver, and the one or more control signals cause the RGB or RBGW LED driver to adjust a current and/or a duty cycle of the one or more power signals generated by the light source driver.
- This Summary is provided solely as an introduction to subject matter that is fully described in the Detailed Description and Drawings. It is to be understood that the following Detailed Description is explanatory only and are not necessarily restrictive of the scope of the invention as defined by the claims.
- The detailed description is described with reference to the accompanying figures. The use of the same reference numbers in different instances in the description and the figures may indicate similar or identical items. Various embodiments or examples ("examples") of the present disclosure are disclosed in the following detailed description and the accompanying drawings. The drawings are not necessarily to scale. In general, operations of disclosed processes may be performed in an arbitrary order, unless otherwise provided in the claims. In the drawings:
-
FIG. 1 is a block diagram illustrating a light fixture that includes a plurality of light sources and light source calibration and aging compensation system, in accordance with one or more embodiments of this disclosure; -
FIG. 2 is a block diagram illustrating a controller for the light fixture and/or light source calibration and aging compensation system illustrated inFIG. 1 , in accordance with one or more embodiments of this disclosure; and -
FIG. 3 is a block diagram illustrating a lighting system that includes a plurality of light fixtures, such as the light fixture illustrated inFIG. 1 , in accordance with one or more embodiments of this disclosure. - Before explaining one or more embodiments of the disclosure in detail, it is to be understood that the embodiments are not limited in their application to the details of construction and the arrangement of the components or steps or methodologies set forth in the following description or illustrated in the drawings. In the following detailed description of embodiments, numerous specific details may be set forth in order to provide a more thorough understanding of the disclosure. However, it will be apparent to one of ordinary skill in the art having the benefit of the instant disclosure that the embodiments disclosed herein may be practiced without some of these specific details. In other instances, well-known features may not be described in detail to avoid unnecessarily complicating the instant disclosure.
- As used herein a letter following a reference numeral is intended to reference an embodiment of the feature or element that may be similar, but not necessarily identical, to a previously described element or feature bearing the same reference numeral (e.g., 1, 1a, 1b). Such shorthand notations are used for purposes of convenience only and should not be construed to limit the disclosure in any way unless expressly stated to the contrary.
- Further, unless expressly stated to the contrary, "or" refers to an inclusive or and not to an exclusive or. For example, a condition A or B is satisfied by anyone of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).
- In addition, use of "a" or "an" may be employed to describe elements and components of embodiments disclosed herein. This is done merely for convenience and "a" and "an" are intended to include "one" or "at least one," and the singular also includes the plural unless it is obvious that it is meant otherwise.
- Finally, as used herein any reference to "one embodiment" or "some embodiments" means that a particular element, feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment disclosed herein. The appearances of the phrase "in some embodiments" in various places in the specification are not necessarily all referring to the same embodiment, and embodiments may include one or more of the features expressly described or inherently present herein, or any combination of sub-combination of two or more such features, along with any other features which may not necessarily be expressly described or inherently present in the instant disclosure.
- A system for light source calibration and aging compensation is disclosed. In lighting systems that include multiple light fixtures (e.g., stacked or daisy chained light-emitting diode (LED) light strips, light tubes, light panels, or the like), the replacement of a light fixture after a period of time may result in color and/or illumination level imbalances between the replaced (new) light fixture and a neighboring (old) light fixture because the light sources (e.g., LEDs) of the new light fixture may run more efficiently (hence brighter) than the light sources of the old light fixture. The system disclosed herein helps to prevent or mitigate color and/or illumination level imbalances between neighboring light fixtures. The system disclosed herein can also provide for more consistent illumination power output by a light source/fixture over its useful lifecycle.
-
FIG. 1 is a block diagram illustrating alight fixture 100 that includes a system for light source calibration and aging compensation, in accordance with one or more embodiments of this disclosure. In embodiments, thelight fixture 100 may be a light strip or any other type of light fixture (e.g., light bulb, light tube, light panel, etc.) that includes a plurality of light sources 102 (e.g., LEDs). For example, thelight fixture 100 may include a light strip for an aircraft cabin lighting system or any other interior/exterior lighting system. - The
light sources 102 may be connected in series with one another. Alternatively, one or more of thelight sources 102 may be connected in parallel or in a combination of series and parallel configurations. In some embodiments, thelight sources 102 include multi-color LED light sources. For example, thelight sources 102 may include red-green-blue (RGB) or red-green-blue-white (RGBW) LEDs or LED chips. In other embodiments,light sources 102 include single-color LED light sources. For example, thelight sources 102 may include individual red, green, blue, and/or white LEDs or LED chips. Alternatively, thelight sources 102 may include a combination of multi-color and single-color LED light sources. - In embodiments, the
light fixture 100 further includes or is coupled to alight source driver 106. Thelight source driver 106 is configured to generate one or more power signals for the plurality oflight sources 102. For example, thelight source driver 106 may be configured to receive an alternating current (AC) or direct current (DC) input from a power source (e.g., an aircraft power system or any other mobile/stationary power system) and generate one or more constant or pulsed DC output signals to power thelight sources 102. In this regard, thelight source driver 106 may include a DC power source (e.g., an AC-DC or DC-DC converter and/or adapter) and/or a pulse width modulator (PWM). In some embodiments, thelight source driver 106 is a RGB or RBGW LED driver that is configured to output a separate power signal for each of the LED colors (e.g., separate red (R), green (G), blue (B), and/or white (W) signals). In this manner, thelight source driver 106 can separately control the LED brightness for each LED color in order to tune individual light sources 102 (e.g., multi-color light sources) or a group of light sources 102 (e.g., single-color or multi-color light sources) to different colors and/or brightness resulting from different combinations and respective brightness of red (R), green (G), blue (B), and/or white (W) LED emissions. - For single-color or
multi-color light sources 102, the illumination power output by the light sources 102 (hence the brightness of the light sources 102) can be controlled by varying current and/or duty cycle of the one or more power signals generated by thelight source driver 106. For example, thelight source driver 106 may be configured to generate higher current power signals to increase LED brightness overall or for one or more selected LED colors (e.g., by increasing the current of the power signals for the one or more selected LED colors). Similarly, thelight source driver 106 may be configured to generate reduced current power signals to decrease LED brightness overall or at one or more selected LED colors (e.g., by reducing the current of the power signals for the one or more selected LED colors). In embodiments, where thelight source driver 106 includes a PWM or any other type of pulsed power source, thelight source driver 106 may be configured to increase or decrease LED brightness overall or at one or more selected LED colors by generating power signals with increased or reduced duty cycle (e.g., by adjusting pulse width and/or frequency of the power signals). - In embodiments, the
light fixture 100 further includes or is coupled to one or more sensors 104 (e.g., one or more photodiodes, photoresistors, or any other photodetectors). For example, thelight fixture 100 may include asensor 104 that is configured to detect an illumination power output by at least onelight source 102 of the plurality oflight sources 102. Thesensor 104 may be positioned adjacent to oneparticular light source 102 or a particular group oflight sources 102. In some embodiments, the illumination power detected by thesensor 104 is used for calibration and/or aging compensation of thelight fixture 100 as a whole (e.g., the measured illumination power is used to calibrate/tune all the light sources 102). In other embodiments, thelight fixture 100 may include a plurality of distributedsensors 104, where each of thesensors 104 is configured to detect an illumination power that is used to calibrate/tune a respectivelight source 102 or a respective group oflight sources 102. Alternatively, thelight fixture 100 may include a plurality of distributedsensors 104, where the measurements from thesensors 104 are averaged or otherwise combined in order to calibrate/tune all thelight sources 102 based on a number of illumination power measurements associated withdifferent illumination sources 102 or groups of illumination sources 102 (e.g., at different locations/zones of the light fixture 100). - The
light fixture 100 may further include or may be coupled to acontroller 200 that is programmed or otherwise configured to perform light source calibration and aging compensation functionality based on the sensor measurements. In embodiments, thecontroller 200 is communicatively coupled to the one ormore sensors 104 and thelight source driver 106. As shown inFIG. 2 , thecontroller 200 may include at least oneprocessor 202, at least onememory 204, and at least onecommunication interface 206. - The
processor 202 provides processing functionality for at least thecontroller 200 and can include any number of processors, micro-controllers, circuitry, field programmable gate array (FPGA) or other processing systems, and resident or external memory for storing data, executable code, and other information accessed or generated by thecontroller 200. Theprocessor 202 can execute one or more software programs embodied in a non-transitory computer readable medium (e.g., memory 204) that implement techniques described herein. Theprocessor 202 is not limited by the materials from which it is formed, or the processing mechanisms employed therein and, as such, can be implemented via semiconductor(s) and/or transistors (e.g., using electronic integrated circuit (IC) components), and so forth. - The
memory 204 can be an example of tangible, computer-readable storage medium that provides storage functionality to store various data and/or program code associated with operation of thecontroller 200/processor 202, such as software programs and/or code segments, or other data to instruct theprocessor 202, and possibly other components of thecontroller 200, to perform the functionality described herein. Thus, thememory 204 can store data, such as a program of instructions for operating thecontroller 200, including its components (e.g.,processor 202,communication interface 206, etc.), and so forth. It should be noted that while asingle memory 204 is described, a wide variety of types and combinations of memory (e.g., tangible, non-transitory memory) can be employed. Thememory 204 can be integral with theprocessor 202, can comprise stand-alone memory, or can be a combination of both. Some examples of thememory 204 can include removable and non-removable memory components, such as random-access memory (RAM), read-only memory (ROM), flash memory (e.g., a secure digital (SD) memory card, a mini-SO memory card, and/or a micro-SD memory card), solid-state drive (SSD) memory, magnetic memory, optical memory, universal serial bus (USB) memory devices, hard disk memory, external memory, and so forth. - The
communication interface 206 can be operatively configured to communicate with components of thecontroller 200. For example, thecommunication interface 206 can be configured to retrieve data from theprocessor 202 or other devices, transmit data for storage in thememory 204, retrieve data from storage in thememory 204, and so forth. Thecommunication interface 206 can also be communicatively coupled with theprocessor 202 to facilitate data transfer between components of thecontroller 200 and theprocessor 202. It should be noted that while thecommunication interface 206 is described as a component of thecontroller 200, one or more components of thecommunication interface 206 can be implemented as external components communicatively coupled to thecontroller 200 via a wired and/or wireless connection. Thecontroller 200 may be connected to one or more input/output (I/O) devices, system components (e.g.,light sources 102,sensor 104,light source driver 106, etc.), and so forth via thecommunication interface 206. In embodiments, thecommunication interface 206 may include a transmitter, receiver, transceiver, physical connection interface, or any combination thereof. - In embodiments, the
controller 200 is configured to compare the illumination power detected by the one ormore sensors 104 to a target illumination power (e.g., a preprogrammed, user selected, calculated, or otherwise determined illumination power for the light fixture). For example, thecontroller 200 may be configured to compare the target illumination with an illumination power measured by asingle sensor 104, a plurality of illumination power measurements frommultiple sensors 104, or an average illumination power measurement based on a plurality of illumination power measurements frommultiple sensors 104. The target illumination power may be a preprogrammed illumination power (e.g., based on initial brightness setting) or an illumination power determined via a calibration sequence. For example, the target illumination power can be a fraction (e.g., in the range of 60% to 90%, e.g., 60%, 65%, 70%, 75%, 80%, 85%, or 90%) of the maximum illumination power output of the light sources 102 (i.e., based on a new/unused light fixture). In some embodiments, the target illumination power may be a known value that is predetermined for thelight fixture 100 based on light source specifications. Alternatively, the target illumination power may be a calculated value determined by running thelight sources 102 at an initial (e.g., maximum or reduced, e.g., 60%, 65%, 70%, 75%, 80%, 85%, or 90%) operating current or duty cycle at installation (or a later performed calibration) and determining the target illumination power based on illumination power detected by the one ormore sensors 104. For example, thecontroller 200 may be configured to detect or calculate the target illumination power by detecting or calculating a fraction (e.g., 60%, 65%, 70%, 75%, 80%, 85%, or 90%) of the maximum illumination power output of thelight sources 102. In other embodiments, the target illumination power may be received by thecontroller 200 from another device (e.g., a lighting system controller, a master light fixture, a user input device, or the like). - Initially setting the target illumination power lower than the maximum illumination power output of the
light sources 102 allows thecontroller 200 to compensate for aging of thelight fixture 100 over time by causing thelight source driver 106 to increase current or duty cycle of power signals generated by thelight source driver 106 when the detected illumination power falls below the target illumination power. For example, thecontroller 200 may be configured to generate one or more control signals to adjust an electrical power output of thelight source driver 106 based on the comparison of the detected illumination power to the target illumination power. In some embodiments, thecontroller 200 may be configured to generate the one or more control signals based on a difference between the detected illumination power and the target illumination power. - In embodiments, the one or more control signals from the
controller 200 are configured to cause thelight source driver 106 to adjust the one or more power signals for the plurality oflight sources 102 until the illumination power detected by the one ormore sensors 104 is equivalent to the target illumination power or within a predefined acceptable tolerance of the target illumination power (e.g., +/- 5%, +/- 10%, +/- 15%, or the like). For example, the one or more control signals may cause thelight source driver 106 to generated the one or more power signals with an adjusted (e.g., increased/reduced) current and/or duty cycle in order to increase/decrease the illumination power (brightness) of thelight sources 102 overall and/or at particular colors (e.g., red (R), green (G), blue (B), and/or white (W)) emitted by thelight sources 102. - In some embodiments, the
light fixture 100 is a light strip, light tube, light panel, or other light structure that has thelight sources 102, one ormore sensors 104,light source driver 106, andcontroller 200 coupled to or at least partially embedded in the lighting structure. For example, the one ormore sensors 104,light source driver 106, and/orcontroller 200 may be at least partially embedded in a substrate that includes a linear, two-dimensional, or three-dimensional array oflight sources 102. Alternatively, one or more of the components may be coupled to the substrate (e.g., directly or via an auxiliary printed board). - Furthermore, in embodiments, the light fixture 100 (e.g., light strip, light tube, light panel, or the like) may be configured to be stacked, daisy chained, or otherwise coupled with one or more neighboring light fixtures 100 (e.g., additional light strips). For example,
FIG. 3 shows an example of thelighting system 300 that includes a plurality of light fixtures 100 (e.g.,light fixtures - The
controllers light fixtures lighting system 300 may be communicatively coupled with one another. For example, thecontrollers - In some embodiments, the
controller 200A of alight fixture 100A may be configured to communicate illumination power detected by arespective sensor 104A to another controller (e.g.,controller light fixture light fixture 100A. In this manner, another light fixture (e.g.,light fixture light fixture 100A. For example, the illumination power detected bysensor 104A oflight fixture 100A can be used as the target illumination power forlight fixture 100B and/or 100C. - In some embodiments, all the
light fixtures 100 in thelighting system 300 are calibrated to a master light fixture (e.g.,light fixture 100A). In other embodiments, all thelight fixtures 100 in thelighting system 300 may be calibrated to the light fixture (e.g.,light fixture light fixture light fixture lighting system 300 may be configured to run all thelight fixtures 100 at the same current or duty cycle and then designate the light fixture (e.g.,light fixture light fixtures 100 to the light fixture (e.g.,light fixture - Although inventive concepts have been described with reference to the embodiments illustrated in the attached drawing figures, equivalents may be employed and substitutions made herein without departing from the scope of the claims. Components illustrated and described herein are merely examples of a system/device and components that may be used to implement embodiments of the inventive concepts and may be replaced with other devices and components without departing from the scope of the claims. Furthermore, any dimensions, degrees, and/or numerical ranges provided herein are to be understood as non-limiting examples unless otherwise specified in the claims.
Claims (4)
- A system (300) for light source calibration and aging compensation, comprising:a first light strip (100A) comprising:a first plurality of light emitting diodes (102A);a first light source driver (106A) configured to generate one or more power signals for the first plurality of light emitting diodes ;a first sensor (104A) configured to detect an illumination power output by at least one light emitting diode of the first plurality of light emitting diodes; anda first controller (200A) communicatively coupled to the first sensor and the first light source driver; anda second light strip (100B) coupled to the first light strip, the second light comprising:a second plurality of light emitting diodes (102B);a second light source driver (106B) configured to generate one or more power signals for the second plurality of light emitting diodes;a second sensor (104B); anda second controller (200B) communicatively coupled to the second sensor and the second light source driver;characterized by the first controller configured to:set the first plurality of light emitting diodes to a target illumination power, the target illumination power being lower than a maximum illumination power output of the first plurality of light emitting diodes;compensate for aging of the first light strip by causing the first light source driver to increase a current or a duty cycle of the one or more power signals when the detected illumination power falls below the target illumination power; andcommunicate the detected illumination power to the second controllerthe second controller configured to:
calibrate the second light strip to the first light strip by using the illumination power output received from the first controller as a second target illumination power. - The system of claim 1, wherein the first light source driver comprises a direct current (DC) power source, wherein the first controller causes the DC power source to adjust the current of the one or more power signals generated by the first light source driver.
- The system of claim 1, wherein the first light source driver comprises a pulse width modulator (PWM), wherein the first controller causes the PWM to adjust the duty cycle of the one or more power signals generated by the light source driver.
- The system of any preceding claim, wherein the first light source driver comprises a red-green-blue, RGB, or red-green-blue-white, RBGW, light-emitting diode, LED, driver, wherein the first controller causes the RGB or RBGW LED driver to adjust at least one of the current or the duty cycle of the one or more power signals generated by the light source driver.
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WO2005050613A1 (en) * | 2003-11-19 | 2005-06-02 | Eizo Nanao Corporation | Method and device for compensating change of liquid crystal display device by lapse of years, computer program, and liquid crystal display device |
US7095056B2 (en) * | 2003-12-10 | 2006-08-22 | Sensor Electronic Technology, Inc. | White light emitting device and method |
US9860965B2 (en) * | 2006-03-28 | 2018-01-02 | Wireless Environment, Llc | Cloud connected lighting system |
US8363069B2 (en) * | 2006-10-25 | 2013-01-29 | Abl Ip Holding Llc | Calibration method and apparatus for lighting fixtures using multiple spectrum light sources and light mixing |
US20090020684A1 (en) * | 2007-07-16 | 2009-01-22 | Cheng-Chung Shih | Illumination apparatus and optical radiation control method thereof |
US7718942B2 (en) * | 2007-10-09 | 2010-05-18 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Illumination and color management system |
US7671542B2 (en) * | 2007-11-07 | 2010-03-02 | Au Optronics Corporation | Color control of multi-zone LED backlight |
US8789988B2 (en) * | 2011-07-21 | 2014-07-29 | Dan Goldwater | Flexible LED light strip for a bicycle and method for making the same |
CN104137651B (en) * | 2012-01-20 | 2018-01-09 | 奥斯兰姆施尔凡尼亚公司 | Illuminator with uniform LED luminance |
US9167656B2 (en) * | 2012-05-04 | 2015-10-20 | Abl Ip Holding Llc | Lifetime correction for aging of LEDs in tunable-white LED lighting devices |
US9635729B2 (en) * | 2015-09-10 | 2017-04-25 | Panasonic Intellectual Property Management Co., Ltd. | Illumination device and illumination system and mobile body including the same |
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